Singapore PSI Nears Unhealthy Levels as Indonesian Fires Intensify on August 26

Singapore’s air quality edged toward unhealthy levels on August 24 as forest fires raged across Indonesian islands. The 24-hour PSI in the central region reached 98 at 9pm, just shy of the 101 threshold that signals unhealthy air. The National Environment Agency detected a sharp escalation in hotspots over the weekend, with smoke plumes visible across Sumatra, Kalimantan, and Riau. Wind patterns blowing from the south and southeast are carrying dense smoke toward Singapore.

What the PSI readings mean right now

Singapore uses two air quality measures. The 24-hour PSI, which averaged 68-90 at midday on August 24 before climbing to 99 by midnight in the central region, reflects daily pollution levels from six pollutants including PM2.5, sulphur dioxide, carbon monoxide and ozone. The NEA will issue daily haze advisories once PSI crosses 100, marking the unhealthy threshold.

The one-hour PM2.5 reading is what matters for immediate outdoor decisions. On August 24 afternoon, PM2.5 levels reached 56 micrograms per cubic meter and above in central and east regions. These particles, 30 times smaller than a human hair, lodge deep in lungs and enter the bloodstream. Check PM2.5 immediately before jogging or outdoor activities.

Why Indonesian fires are spreading smoke now

Sumatra and Kalimantan have been burning for weeks, fuelled by a super El Nino that dried vegetation across the region. The escalation accelerated over the weekend of August 24-25, with hotspots and dense smoke plumes detected mainly in Kalimantan and southern Sumatra, plus additional activity in Riau. Dry conditions are expected to persist through the week.

Wind direction determines Singapore’s exposure. Prevailing southeasterly and southwesterly winds are currently blowing smoke directly across the Malacca Strait. Malaysia was already hit harder, with 30 areas reporting unhealthy air quality on August 25, including Serian in Sarawak at an API reading of 180.

What happens if PSI crosses 100

Once the 24-hour PSI enters the unhealthy range above 100, the NEA will issue daily haze advisories. The government’s inter-agency haze task force, chaired by NEA and comprising 28 public agencies, stands ready to activate tiered response plans. The task force convenes yearly before the dry season in June and has already met twice in 2026: once in January after peatland fires in east Johor, and again in April.

Residents can track updates via the NEA website, the haze microsite, the myENV application, and social media. Air quality in Singapore as of August 24 at 6pm ranged from 70-94 across regions, still in the moderate band.

Health guidance for sensitive groups

People with respiratory disease such as asthma should limit prolonged outdoor exertion when PM2.5 is elevated. Active children and adults in sensitive groups face similar restrictions. At PM2.5 levels above 100, sensitive groups should avoid prolonged exertion entirely. The general public faces no restrictions until PSI enters the unhealthy range, though individuals with asthma or heart conditions should monitor readings closely during haze periods.

Final Thoughts

Singapore’s air quality remains in moderate territory but is trending toward unhealthy levels as Indonesian fires intensify. Watch PM2.5 readings before outdoor activity and PSI announcements for official haze advisories. The situation hinges on wind direction and fire intensity over the coming days.

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